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Memory Map

The following is a memory map that was generated based on the MAME source code (.180).  This information is only as accurate as the MAME driver is.  If you see any errors, please let me know what that error is.
 
The Memory Area is related to where the information is from (CPU, Sound Board, etc..), and it may also reflect what it has in common with other hardware.
Tugboat (Enter-Tech, Ltd., 1982)
Memory Area:main_map
Address RangeLengthFunctionDescription
0x0000-0x01FF512RAM, Sharedram
0x1060-0x10612Device Writeaysnd, ay8910_device, address_data_w
0x10A0-0x10A12Writehd46505_0_w (/* scrolling is performed changing the start_addr register (0C/0D) */)
0x10C0-0x10C12Writehd46505_1_w
0x11E4-0x11E74Device Read/Writepia0, pia6821_device, read, write
0x11E8-0x11EB4Device Read/Writepia1, pia6821_device, read, write
0x0001UnusedActive Low
0x0002UnusedActive Low
0x0004UnusedActive Low
0x0008UnusedActive Low
0x00002C_1CActive High
0x00101C_1CActive High
0x00201C_2CActive High
0x00301C_4CActive High
0x00003Active High
0x00405Active High
0x0000OffActive High
0x0080OnActive High
0x18E0-0x18EF16Writescore_w
0x2000-0x2FFF4096RAM(/* tilemap RAM */)
0x4000-0x7FFF16384ROM
 

ROM Map for this game

 
This is the ROM map for the game.  This should tell you what address the ROM is at, how big it is, what it's used for.   
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048u67.binCRC(601c425b) (Fluke: 6B7B)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096u68.binCRC(d5835182) (Fluke: 8282)
0x1000-0x1FFF4096u69.binCRC(e6d25878) (Fluke: AB40)
0x2000-0x2FFF4096u70.binCRC(34ce2850) (Fluke: 15FC)
Memory Area:gfx3
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048u168.binCRC(279042fd),labeled u-167 (Fluke: B3AD)
Memory Area:gfx4
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048u170.binCRC(64d9f4d7),labeled u-168 (Fluke: A0CB)
0x0800-0x0FFF2048u169.binCRC(1a636296),labeled u-169 (Fluke: BBDE)
0x1000-0x17FF2048u167.binCRC(b9c9b4f7),labeled u-170 (Fluke: 06D9)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x5000-0x5FFF4096u7.binCRC(e81d7581) (Fluke: 09F4)
0x6000-0x6FFF4096u8.binCRC(7525de06) (Fluke: 063F)
0x7000-0x7FFF4096u9.binCRC(aa4ae687) (Fluke: 92C5)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256nt2_u128.clrCRC(236672bf) (Fluke: D0C7)
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